Drawing rolls for spinning machines



May 9, 1944. w. BESWICK DRAWING ROLLS FOR SPINNING MACHINES Filed Sept. 4 1942 2 Sheets-Sheet 1 WILLIAM BESWICK INVE/VTGE 5? v 7,4r7'ogn/EY May 9; 1944. w. BESWICK DRAWING ROLLS FOR SPIRNING MACHINES Filed Sept 4, 1942 2 Sheets-Sheet 2 WILLMM Bisw/cx I BY 64 Patented May 9, 1944 T UNITE PATEN r OFFICE A nRAwiNG ROLLS roe SPINNING MACHINES William Beswi'ck, Birmingham, Ala;-

- Application September 4, 1942, Serial No.457,2'77 6 Claims., ((11. 195130) My invention relates .to drawing rolls for attenuating machines 'intextile' mills, such as the drawing, .slubbing, f intermediate, speeder and spinning frames. a a

Oneof the objects of this invention is toprovide drawing rolls for such attenuating machines in which the pressure on the roving is exerted over a relatively wide area, whereby the fibers are evenly drawn and not pulled out of turn.

A further object of my invention is to provide drawing rolls for use in attenuating machines in which the rolls cooperate with concentric troughs in closely spaced relation to the rolls, and the roving is caused to passbetweenthe rolls and the troughs, thereby providing a'much longer and evener draft than is possible where roving is caused to travel between cooperating rolls. a

A still further object of my invention is to provide an apparatus of the character designated in which a plurality of drawing rolls are caused to cooperate with closely adjacent concentric troughs providing ridges between the adjacent troughs over which'the roving is drawn and in which the proper pressure between the rolls and the troughs may be obtained by adjustment of the troughs'with relation to their cooperating rolls. 7

As is well known in the art to which my invention relates, the drawing of roving in textile mills is usually accomplished by a pluralityof pairs of drawing rolls arranged in series-between which the roving passes with progressively increasing speeds of rotation for'the successive pairs of rolls. Each'pair of rolls has a relatively firm grip on the roving and in order to accomplish the draft, it is necessary for the several pairs of rolls to be spaced apart a distance'at least slightly greater than the length .of the fibers making up the roving. This'results in an uneven drawing, because" the fibers are always drawn atthe weakestpoint in theroving, and in spite of careful attention to operation, uneven places in the yarn can be detected;

In accordance with my inventiomthis difficulty is overcome by effecting the draft through aseries of single drawing rolls which cooperate with concentric troughs, forming ridges between the rolls, and which may be spaced closely adjacent, or much closer than the length of staple or fiber from which the yarn is being spun. By this means, none of the fibers can be drawn out of turn, but all are acted upon evenly by the rolls. It is contemplated by my invention that the successive rolls will have progressively increasing speedsas in attenuating apparatus heretoforeknown to'the art; whereby the desired draft may be obtained. The "adjustment of the troughs; with relation to the rollsppermits an even pres-,-

sure on the roving which provides an even draft of the-fibers. It is further contemplated that the rolls may be spaced apart at varying distances to accommodate various lengths of fibers. The troughs may be of any suitable material, such as machined metal, pressed metal,- porcelain, glass or plastic material. The drawing rolls are preferably'fluted:metalin "order to obtain a better grip onthe fibers. 1

Apparatus embodying features-of my invention is illustrated in the accompanying drawingsforming a part of this application in which Fig. 1 is a front elevational view of a-drawing' roll. assemblymade in accordance with my-invention;

Fig; 2 is an end view of the same;

4 Fig. 3 is asectional view taken along the line III 'III of Fig. 1;

Fig. 4 is a detail section l'viewof one form of cooperating trough ,employedwith my invention; 7

lil and ll, in'which the -rolls are supported.

Spanning the stands l0 and ill, and secured thereto by any suitable'means, is a bottom plate I2. Frontbearing supports l3 and'l4 are slidably mounted on the stands! "and H resp'eo-j tively, and-rear bearing supports I6 (o'nly'one of which is shown) are mounted on the rear of the'roll'sta'nds.v 'Mounted on the'bearing support Mare intermediate bearings IT, l8 and I9, duplii cate bearings .(not shown) "being provided on the opposite stand' Ill. :The bearing supports l4, I1. I 8 and [9 are slidable with respect to each other and are .held in position bya'bolt 2i; The dis tances between the rolls may thusbe adjusted in a. manner well understood. Likewise, the bearingsupportlfi is slidable with respect to the roll stand and is held in place by'an'adjustin'gbolt22'. I

Mounted in the-bearing support I4 is a'bottom fluted metal roll 23; which preferably cooperates with'an upper covered-roll 24, although a fluted top roll may be employed, as is wellunderstood. Likewise, at the back of the assembly'i'n-bearing support l6 a'bottom fluted'metalroll' 26 and'a covered top roll 21 are employed. These rolls may have any suitable covering known to the art. The top rolls 24 and 21 may be weighted by means of a saddle 28, bridle 29, and Weighted lever arm 3|. 7

Interposed between the front and back pairs of rolls already described are three intermediate single rolls 32, 33, and 34, which are preferably made of metal and fluted. The roll 32 cooperates with a concentric trough 36, the roll 33 with a concentric troughB'l, and the roll 34 with a concentric trough 3.8. In the embodiment shown in Fig. 3, the troughs are formed in separate blocks of metal 39, 4| and 42 respectively, which are machined out and polished. Ihey are held in position by means of end straps 43 (see Fig. 4), each of which is provided with aiongie tudinal slot 44 to receive clamping screws 45. The troughs are supported and *held in proper adjusted positions with respect to the rolls by means of adjusting screws 41, 48 and 49, which pass through the bottom plate 12. Each of said screws is provided with nuts and :52 to hold it in its adjusted position. It will be noted that where the blocks 39, 4| and '42 join, they form ridges, such as 53 and 54, between them. It will also be noted that each trough defines, in cross section, slightly less'than a semi-circle, so that-the centers of the rolls are above the sides of the troughs. It will further be noted, by reference to Fig. 3 that the block 42 is so shaped as to provide aconsider able distance, defined by a fiat surface 56', between the back rolls 25 and 21 and the first intermediate roll 34. This distance is to provide a ""break draft or slight loosening of the twist in the roving; and is pref erably made slightly greater than the average length of staple or fiber being spun. An opening 55 is provided through the block "4| between sections of the roll 33 to provide a passage for the bridle 29.

From the foregoingv the operation of the apparatus so far described will be apparent.- The roving indicated by the letter S enters between the back rolls 26 and 21 through the: trumpet indicated at 51. It passes over the surface 56, which permits the fibers to loosen slightly before the drawing begins. The roving then passes sue:- cessively under the fluted rolls '34, 33, and 32, across the troughs 38, 31, and rain the order named, and out between the front rolls 23 and 24. It will be understood that the rolls are driven at progressively increasing speeds from backto front in a manner well understood and which is not shown in the drawing- For example, the ratio of speed of the roll 34 to rolls 2.6 and-21 will be the usual break-draft .of 1.15 to 1.25.. The ratio of speed of roll .33. to 34 may be from 3.00 to 4.00; and the ratio of the speed .of roll .32 to 33 may be from 5.00 1306.00. The ratio of the speed of the front pair of rolls 23 and.24 to roll 32 would be approximately 1.10, as the drawing has already been completed by the time the roving leaves the front intermediate roll 32. It will be seen that by means of my inven-.- tion, the roving is contacted by each of the fluted intermediate rolls for a distance almost equal to one-half the circumference'of the'roll, and partial drawing may occur for the entire "distance the roving is being pulled across the trough, It appears, however, that the principal partlof the drawing occurs: as the roving 'is passing over the ridges 5'3, and 54; -;Pla.cing the centers of the intermediate rolls above the ridges 53 and 54 and surface56 causes the roving to enter underneath the rolls and prevents any difiiculty in threading the roving through the rolls.

Referring to Fig. 5, I show the blocks 39, 4| and 42 spaced apart by means of spacer blocks 6| and 62. By the provision of such spacer blocks, and by the adjustment of the positions of the bearing supports ll, I8 and |9, any desired spacing between the intermediate rolls 32, 33 and 34 may be obtained. 1

In Fig. 6 I show a form of my invention in which the troughs 36, 31 and 38 are formed in a molded block 63, which may be made of any noldable material, such, for example, as glass,

resin, pprcelain, or of many other materials which will suggestthemselves to those skilled in theart. The molded block thus formed may be secured to a suitable backing 64 by screws 66. A still turther 'form of my invention is shown in Fig.4, in which the troughs 36, 3! and 33 are formed of pressed metal and secured to a suitable backing 6'! by screws 68.

From the foregoing it will be apparent that I have devised ani-mproved attenuating apparatus for textile mills which is simple of design and operation, and by means of which an improved drawing of the roving maybe effected.

While I have shown myinvention in several forms, it will be obvious to those skilled in the art that it is not so limited, 'but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appended claims.

What I claim is:

'1 In a textile attenuating apparatus, the combihation of a plurality of spaced drawing rolls driven at progressively increasing speeds, troughs in which parts of the rolls are adapted to rotate in spaced relation thereto and defining between the troughs ridges over which roving-is adapted to'b'e drawn, and means to pass roving to be drawn in series between the rolls and the troughs transversely of the ridges.

2. In a textile attenuating apparatus, the combination of a plurality of spaced drawing rolls driven'at progressively increasing speeds, troughs in which parts of the rolls are adapted to rotate inspaced relation thereto, and defining between the troughs ridges over which roving is adapted to be drawn, means to pass rovingto be drawn in series between the rolls and the troughs transversely of the ridges, and means to adjust the position of the troughs toward and from the rolls.

ln a tex i e n t n p tu a on pair oi r ll a ack a r f ol a p u al y of single int rm iate ro ls i t rp sed bet een the from a dback ro ls and ri en a p ogr s i ely increasing speeds from back to front, trou h cooperating with the intermediate rolls and pro.- viding ridges between adjacent rolls, and means to pass roving transversely between the inter mediate rolls and the troughs to effect a drawing of the sa i g 7 1 54. Apparatus as defined in claim 3, in which th ack pa ofll s sp e rom h next dj cen s n le 011 is n e g ea e han h lengt of .fi er f om Which the roving is eing pun t p rmi a break draft bet e n sa d ro s- 5; Apparatus as definedin claim 3, in which e trmieh a o med i s pa at b ocks and mean ar p o id d to space the blocks laterally it res ect s each ot r. o ether with spacer p e filling the intervening s aces between sa d separate blocks and secured in place with respect thereto.

6. In a textile attenuating apparatus, a basis pair of rolls, a front pair of rolls, a plurality of single intermediate rolls interposed between the front and back rolls, said rolls being driven at progressively increasing speeds from back to front, troughs cooperating with the intermediate rolls and providing ridges between adjacent rolls,

WILLIAM BESWICK. 

